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Did you know… last month's widespread WannaCry ransomware attack forced Microsoft to release security updates against EternalBlue SMB exploit for unsupported versions of Windows, but the company left other three Windows zero-day exploits unpatched?

For those unaware, EternalBlue is a Windows SMB flaw that was leaked by the Shadow Brokers in April and then abused by the WannaCry ransomware to infect nearly 300,000 computers in more than 150 countries within just 72 hours on 12th of May.

Shortly after WannaCry outbreak, we reported that three unpatched Windows exploits, codenamed "EsteemAudit," "ExplodingCan," and "EnglishmanDentist," were also being exploited by individuals and state-sponsored hackers in the wild.

But now Microsoft has released free security updates for unsupported versions of its products, including Windows XP and Server 2003, to patch all the three cyber-weapons and block next wave of "destructive cyberattacks" similar to WannaCry.

According to the recent Microsoft blog post, the critical down-level patches for three Windows exploits were prompted by an "elevated risk of destructive cyberattacks" by government organizations, referred to as "nation-state actors or other copycat organizations."

The security patches for Windows XP, Vista, and Server 2003 contain fixes or mitigations for three alleged NSA-developed exploits — EsteemAudit, ExplodingCan, and EnglishmanDentist — though none of these exploits works on supported Windows platform.

Unlike regular Patch Tuesday releases that delivered automatically through the Windows Update mechanism to your devices, these down-level patches must be downloaded and installed manually.

These updates are available in the Microsoft Download Center or, in the Update Catalog, or you can find download links at the bottom of Security Advisory 4025685.

No doubt, this move by Microsoft to protect its customers by releasing security updates for end-of-support products is commendable, but this could also motivate users to stick to 14-years-old unsupported and risky versions of Windows OS that are exposed to all manner of potential threats.

And since Microsoft is fixing known vulnerabilities in Windows XP and Server 2003 that weren't fixed before, the job of migrating away from unsupported versions just got a whole lot harder than before.

However, Eric Doerr, general manager of the company's Security Response Center, said in a separate blog post that the move was only meant to fix flaws that are at "heightened risk of exploitation due to past nation-state activity and disclosures."

"Our decision today to release these security updates for platforms not in extended support should not be viewed as a departure from our standard servicing policies," Doerr said. "Based on an assessment of the current threat landscape by our security engineers, we made the decision to make updates available more broadly."

However, Doerr urged users to adopt new, supported versions of Microsoft products, which are significantly more secured and resistant to exploits, and warned them not to expect regular security updates for out-of-date platforms in the future.

Meanwhile as part of its regular Patch Tuesday, Microsoft has released security updates to patch nearly a hundred flaws in its various Windows operating systems and software, two of which have actively been exploited in the wild.

All the regular releases are delivered automatically through the Windows Update mechanism to users running supported versions of Windows OS, including Windows 10, 8.1, 7, and post-2008 Windows Server releases, on their devices.